检索结果-南通市图书馆

Chinese Chemical Letters 2005年第6期16卷 736-738页

作者： JunGuiDAI LinYANG JunIchiSAKAI MasayoshiANDO neering NiigataUniversityIkarashi2-8050Niigata950-2181Japan DepartmentofChemistryandChemic-alEngineering NiigataUniversityIkarashi2-8050Niigata950-2181Japan／／CollegeofLifeandEnvironmentalSciencesTheCentralUniversityforNationalitiesBeijing100081 DepartmentofChemistryandChemicalEngineering NiigataUniversityIkarashi2-8050Niigata950-2181Japan

Sinenxan A [2α, 5α, 10β, 14β-tetraacetoxytaxa-4(20), 11-diene, 1] was biotransformed by a filamentous fungus, Aspergillus niger JCM 5546, and an unusual taxatetraene [2α, 5α-acetoxytaxa-4(20), 10(11), 12(18), 13(14)-tetraene, 2], together with two known products, 10β-deacetyl sinenxan A (3) and 10β, 14β-dideacetyl sinenxan A (4) were produced.

关键词： Aspergillus niger sinenxan A taxatetraene biotransformation.

Boundary parametrization of planar self-affine tiles with collinear digit set

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第9期53卷 2173-2194页

作者： AKIYAMA Shigeki LORIDANT Benoit Department of Mathematics Faculty of ScienceNiigata UniversityIkarashi 28050 Niigata9502181Japan

We consider a class of planar self-affine tiles T = M-1 a∈D(T + a) generated by an expanding integral matrix M and a collinear digit set D as follows:M =(0-B 1-A),D = {(00),...,(|B|0-1)}.We give a parametrization S1 →T of the boundary of T with the following standard *** is H¨older continuous and associated with a sequence of simple closed polygonal approximations whose vertices lie on T and have algebraic *** derive a new proof that T is homeomorphic to a disk if and only if 2|A| |B + 2|.

关键词： self-similar tile boundary disk-likeness fractal parametrization

Optical near-field excitation using liquid crystals on nanostruc- tured photoreactive molecular thin films

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1351-1355页

作者： OHDAIRA Yasuo SHINBO Kazunari BABA Akira KATO Keizo KANEKO Futao Graduate School of Science and Technology Niigata University 2-8050 Ikarashi Nishi-ku Niigata City Niigata 950-2181 Japan Center for Transdisciplinary Research Niigata University 2-8050 Ikarashi Nishi-ku Niigata City Niigata 950-2181 Japan

Optical near-field excitations were investigated on the basis of molecular alignment control of liquid crystals (LCs) on an optically rewritable nanostructure of photoreactive molecular thin films. Twisted nematic (TN) cells of LC molecules were constructed utilizing ITO substrates with 260 nm gratings of an azobenzene molecular thin film, fabricated using standing evanescent waves. The polarization changes of light transmitted through the TN cells, which were due to the alignment changes of LC molecules locally rubbed by the azobenzene nanogratings, were observed. Furthermore, we demonstrated local plasmon excitation of Au nanowires deposited on the azobenzene nanogratings using oblique vacuum evaporation, a phenomenon that produced strong anti-optical absorption spectra. The modulation of the local plasmon resonance in metallic nanowires decorated with LC molecules was confirmed.

关键词： optical near-field azobenzene molecular thin film liquid crystal optical polarization local plasmon excitation

New Triterpenes from Siyekucai (Ixeris chinensis)

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第2期17卷 195-197页

作者： Shu Jun ZHANG Jin Lan WANG Qi Gang DENG Masayoshi ANDO Department of Chemistry and Engineering Qiqihar University Qiqihar 161006 Niigata University Ikarashi 2-8050 Niigata 950-2181 Japan

Three new triterpenes, 3β,21α-dihydroxylupen-18（19）-en （1）, 3β,25-dihydroxytirucalla- 7,23（24）-dien （2）, and 21α-hydroxy-19α-hydrogentaraxastero1-20（30）-en （3） were obtained from an ethyl acetate extract of the whole plant of Siyekucai （Ixeris chinensis）. The structures of 1-3 were determined by spectroscopic methods （EIMS, IR, 1D and 2D NMR）.

关键词： Ixeris chinensis trierpene 3β 21α-dihydroxylupen-18(19)-en (1) 3β 25-dihydroxy-tirucalla-7 23(24)-dien 21α-hydroxy-19α-hydrogentaraxastero1-20(30)-en.

CO_2 sequestration utilizing basic-oxygen furnace slag:Controlling factors,reaction mechanisms and V–Cr concerns

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2016年第3期28卷 99-111页

作者： Tung-Hsin Su Huai-Jen Yang Yen-Hong Shau Eiichi Takazawa Yu-Chen Lee Department of Earth Sciences National Cheng-Kung UniversityTainan 70101Taiwan Department of Marine Biotechnology and Resources National Sun Yat-Sen UniversityKaohsiung 80424Taiwan Department of Geology Niigata University8050Ikarashi 2-no-choNishi-kuNiigata 950-2182Japan China Steel Corporation 1Chung-Kang Rd.Kaohsiung 81233Taiwan

Basic-oxygen furnace slag（BOF-slag） contains 〉35%CaO,a potential component for CO_*** this study,slag-water-CO_2 reaction experiments were conducted with the longest reaction duration extending to 96 hr under high CO_2 pressures of 100-300 kg/cm2 to optimize BOF-slag carbonation conditions,to address carbonation mechanisms,and to evaluate the extents of V and Cr release from slag *** slag carbonation degree generally reached the maximum values after 24 hr slag-water-CO_2 reaction and was controlled by slag particle size and reaction *** maximum carbonation degree of 71%was produced from the experiment using fine slag of〈0.5 mm under 100℃and a CO_2 pressure of 250 kg/cm^2 with a water/slag ratio of *** release from the slag to water was significantly enhanced（generally 〉2 orders） by slag *** contrast,slag carbonation did not promote chromium release until the reaction duration exceeded 24 ***,the water chromium content was generally at least an order lower than the vanadium concentration,which decreased when the reaction duration exceeded 24 ***,long reaction durations of 48-96 hr are proposed to reduce environmental impacts while keeping high carbonation *** textures and water compositions indicated that Mg-wustite,in addition to CaO-containing minerals,can also be ***,the conventional expression that only considered carbonation of the CaO-containing minerals undervalued the CO_2 sequestration capability of the BOF-slag by^20%.Therefore,the BOF-slag is a better CO_2 storage medium than that previously recognized.

关键词： Mineral CO_2 sequestration BOF-slag Carbonation

ENVIRONMENTAL COMPATIBILITY OF FLY ASH INCORPORTAED CONSTRUCTION MATERIALS

在线全文

学校读者我要写书评

暂无评论

ENVIRONMENTAL COMPATIBILITY OF FLY ASH INCORPORTAED CONSTRUC...

西南日本黒濑川带的解剖:晚二叠世和早侏罗世增生混杂岩的构造-地层学与浅变质作用(英文)

第五届水泥与混凝土国际会议

作者： M.Hisada T.Saeki S.Nagataki Department of Civil Engineering and Architecture Niigata University 8050Ikarashi 2-no-cho Niigata 950-2181Japan

The leaching of heavy metals, such as Cr (total chromium and Cr6+),Pb, Cd, Zn, Mn and so on, in fly ash cement mortars and cement-solidified fly ashes has been investigated by tank leaching and shaken extraction test methods;comparisons were made between the leachability of heavy metals under different pH conditions and of metals from specimens at different curing ages. In addition, a pH controlled shaken extraction test method was proposed. The results of this study mainly indicate that: (1) heavy metals do leach from the tested specimens;(2) compared with the tank leaching test,a shaken extraction test can extract more toxic heavy metals;(3) the leachability of some heavy metals is greatly dependent on leachant pH;and (4) increased leaching of both Cr and Cr6+ will occur when cement mortars have been carbonated.

关键词： leaching heavy metal cement fly ash environmental impact

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

地球学报 2012年第S1期33卷 16-17页

作者： Hidetoshi HARA Kurihara TOSHIYUKI Hiroshi MORI Geological Survey of Japan AIST1-1-1 HigashiTsukubaIbaraki 305-8567Japan Graduate School of Science and Technology Niigata University8050 Nino-choIkarashiNiigata 950-2181Japan Department of Earth & Planetary Sciences Graduate School of Environmental StudiesNagoya UniversityNagoya 464-8601Japan

The Kurosegawa belt forms a relatively narrow terrane that can be traced continuously throughout southwest and central *** major constituent continental fragments of the Kurosegawa belt include Early Paleozoic graniti... 详细信息

关键词： Kurosegawa belt accretionary complex Jurassic radiolarians southwest Japan

LATE CENOZOIC GOLD VEINSAND VOLCANICCOLLAPSE TECTONICSIN THE ISLAND ARCJUNCTIONSOF THE JAPANESE ISLANDS

在线全文

学校读者我要写书评

暂无评论

Geotectonica et Metallogenia 2001年第1期25卷 85-92页

作者： Yoshihiro KUBOTA Dept.of Environment Sci. Fac.of Sci.Niigata University8050 Ikarashi 2-no choNiigata-shi 950-2181Japan

0 IntroductionThe Japanese Islands consist of five volcanic arcs (Fig.1).The North-East and SouthWest Japan arcs together form the Honshu arc,to which the Kurile arc joins at Hokkaido,whereas the Izu-Mariana arc joins at Izu-Fossa Magna,and the Ryukyu arc joins at *** regions where volcanic arcs converge,are termed 'island arc junctions'.

关键词： LATE CENOZOIC GOLD VEINSAND VOLCANICCOLLAPSE TECTONICSIN THE ISLAND ARCJUNCTIONSOF THE JAPANESE ISLANDS

Frequency stabilization of a semiconductor laser using both Rb saturated absorption profiles and double optical feedback systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frequency stabilization of a semiconductor laser using both ...